Cut-off valve for sawmill-carriages.



W; W. HARMAN.

CUT-OFF VALVE FOR SAWMILL CARRIAGES'.

1,285,695. Patented Nov. 26, 1918.

WILLIAM W. HARMAN, WILLIAMSPORT, PENNSYLVANIA.

CUT-OFF VALVE FR SAWMILL-CARRIAGES.

Specification of Letters Patent.

Patented Nov. 2e, rais.4

Application filed December 26, 1916. Serial No. 138,947.4

To all whom t may concern:

Beit known that I, WILLIAM W. HARMAN, a citizen of the United States,residing at Williamsport, in the county of Lycoming and State ofPennsylvania, have invented certain new and useful Improvements inCut-Gif Valves for Sawmill-Carriages, of which the following is aspecification.

This invention relates to steam engine valves, and more specifically tocut-off valves for saw mill carriages.

The object of my invention is to provide a cut-oil'1 valve adaptable foruse in connection with a steam operated mechanism for controlling sawmill carriages. It is a well known fact in connection with saw milloperations that conditions often arise which render it necessary ordesirable to immediately stop the carriage. With the present type ofvalve this is impossible, since when the steam is cut off in the inletpipe, a quantity of steam still remains in the cylinder. My inventionembodies means whereby, when the steam is cut oif, any residual steam inthe cylinder will be instantly exhausted therefrom, thus insuring aninstant and positive stopping of the saw mill carriage, and lesseningthe danger of accident in such operations. l

Furthermore, I provide a simple, durable device, cheap in the cost ofmanufacture and one that may be readily installed upon any machine.

Other objects of this invention not at this time more particularlyenumerated, will be clearly understood from the detailed description anddra-wings forming a part of this specification.

Furthermore, this invention consists in the novel arrangements andcombination of parts more particularly described in the followingspecication and embodied in the claim appended hereunto and forming apart of this application.

Referring now to the drawings, which are merely illustrative of myinvention,

Figure l is a vertical section of my improved cut-oiil valve.

Fig. 2 is a horizontal section taken on the line 2-2 of Fig. l showingthe valve open admitting steam into the cylinder.

Fig. 3 is a similar view showing the valve in closed position allowingthe steam to be exhausted from the cylinder.

Referring further to the drawings, wherein similar reference charactersdesignate similar parts throughout the respectiveI -alinement to saidinlet port 3 and outlet port 5 and is adapted to receive a pipe 8permitting the exhaust of steam which is in the cylinder when the valveis cut off. A valve stem 9 coextensive in size with said bore 2 isadapted to seat within said bore and be retained therein by means of acapv 10 secured to the casing l. Said valve-stem 9 is provided with asubstantially diametrical recess ll adapted to register with either pairof adjacent ports as will be apparent from a comparison of Figs. 2 and3. A handle 12 is provided at the upper end of said valvestem wherebysaid valve may be readily controlled.

From the foregoing description it is obvious that when the valve is openas shown in Fig. 2, the steam will be allowed to pass from pipe e topipe 6 as indicated by the arrows. When it is desired to stop themachine to which my valve is applied by merely turning the handle ninetydegrees the recess ll will register with the ports 5 and 7 as shown inFig. 3, thereby immediately cutting off the steam supply from pipe 4 andinstantly releasing any steam that is in the cylinder through exhaustpipe 8.

The utility, adaptability, and advantages of my improved form ofcut-oii1 valves for saw mill carriages being obvious, it is unnecessaryto further enlarge upon the same herein.

Having now described and pointed out the new and useful features of myinvention, I do not limit myself to the shape of certain parts where theshape is not essential, nor do I restrict myself to the exact details ofconstruction shown and described, but mean and intend to claim allequivalents and variations thereof not departing in principle from myinvention, and falling within the purview of the appended claim.

What I claim as my invention and desire to secure by Letters Patent is:

A cut-off valve includinT a casing provided With a vertical bore, saidcasing having a pair of transverse aliining ports through opposite sidesthereof off-center of the bore and communicating with the bore, thecasing having an additional transverse port off-center of the bore andextendingV through the side Wall farthest from that portion throughwhich the alining ports are disposed, said last mentioned portcommunieating With the bore in the horizontal plane of the aliningports, a concentrically mounted vertically disposed valve steinrotatable in the bore of the easing and formed with a substantially7diametrical recess disposed in the same horizontal plane with the ports,and means for bringing' the recess in registration With certain of saidports.

In testi1nonv whereof I aiiX my signature hereto.

WILLIAM 7. HARMAN,

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

